You ask what are the odds of each rain drop falling exactly where it falls. The answer is: it is certain that each rain drop falls exactly where it falls. And that's not as silly an answer as it may sound - the point is that while there may be lots of different ways it can fall, it does *have* to fall in *some* way or other, and once its happened, the chance of it having happened in that way becomes 1, or certainty. If you flip a coin, there is a 50% chance of it coming down heads, and a 50% chance of it coming down tails. But what you mustn't do is confuse the likelihood of each outcome with the likelihood of ANY outcome, i.e. the fact that it has a 50/50 chance of coming down heads doesn't mean it only has a 50/50 chance of coming down at all. Likewise, a raindrop may only have a one-in-a-million chance of hitting the ground in the exact position that it does, but that doesn't mean that there is only a one-in-a-million chance of it happening, only that there are a million WAYS in which it *could* happen.